<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <!-- 此处函数加上括号则不能传递事件对象 -->
        <button @click='handleClick'>点我</button>
    </div>

    <script src='./js/vue.js'></script>
    <script>
        new Vue({
            el: '#app',
            methods: {
                handleClick(event) {
                    console.log(event)
                }
            }
        })
    </script>
</body>

</html>